I've completed my 12th PCMB-69.5% in 2015.I've studied in 2 colleges with physics & maths major & dropped out because I'm not satisfied with the teaching.I've applied for BA English (correspondence) in 2018.I wish to do BS from IISC.If I secure great rank in NEET 2021,is my study gap a problem?

Sindhuja, now there is no upper age limit for NEET which means you can appear for NEET. Having a gap is not a problem should you secure a good rank. Many Candidates drop a year or 2 before cracking NEET and joining Colleges. Such Candidates produce gap certificates. So even you can submit a gap certificate and you should be absolutely fine. You should score a minimum aggregate of 50% in Physics, Chemistry and Biology. It is 50% for General Category, 45% for PWD and 40% for OBC, SC, ST. As long as you fulfil thus criteria, you are eligible for NEET.